Exposure calculating apparatus

Abstract

The disclosure relates to an exposure calculation apparatus which includes plural light measuring devices for measuring lights incident on a plurality of regions of a photographing image plane and outputting measured data of the lights; plural devices for detecting the focusing conditions of objects present in a plurality of the regions of the photographing image plane and outputting data on the focusing conditions; a position detecting devices for detecting the position which a main object occupies in the photographing image plane on the data on the focusing condition outputted from the focusing conditions detecting devices; calculation device for making a plurality of calculations each of which is made depending on at least one of the data of measured lights outputted from the light measuring devices; and selecting devices for selecting one of the plurality of calculations on the position detected by the position detecting devices and the data on the focusing conditions of the position.

What is claimed is: 
     
       1. An exposure calculation apparatus comprising: plural first means for measuring light incident on a plurality of regions of a photographing image plane and outputting data of the measured light;   plural second means for detecting the focusing conditions of objects present in a plurality of the regions of the photographing image plane and outputting data on the focusing conditions;   third means for detecting the position which a main object occupies in the photographing image plane depending on the data on the focusing conditions outputted from said second means;   fourth means for making a plurality of calculations, each of which is made depending on at least one of the data of measured light outputted from said plural first means; and   fifth means for selecting one of the plurality of calculations depending on the position detected by the third means and the data on the focusing conditions of the position.   
     
     
       2. An exposure calculation apparatus as claimed in claim 1, wherein said first means measure light which has transmitted through a photographing lens. 
     
     
       3. An exposure calculation apparatus as claimed in claim 1, wherein said second means comprise plural light receiving means for receiving light which have transmitted through a photographing lens and a focusing condition detecting means for detecting a focusing condition depending on respective outputs of the light received by said light receiving means. 
     
     
       4. An exposure calculation apparatus comprising: plural first means for measuring light incident on a plurality of regions of a photographing image plane and outputting data of the measured light;   plural second means for detecting the focusing conditions of objects present in a plurality of the regions of the photographing image plane and outputting data on the focusing conditions;   third means for detecting the position which a main object occupies in the photographing image plane depending on the data on the focusing conditions outputted from said second means;   fourth means for inputting the data of the focal length of a photographing lens;   fifth means for making a plurality of calculations, each of which is made depending on at least one of the data of measured light outputted from said plural first means; and   sixth means for selecting one of the plurality of calculations depending on the position detected by said third means and the data of the focal length inputted by said fourth means.   
     
     
       5. An exposure calculation apparatus as claimed in claim 4, wherein said first means measure light which is transmitted through the photographing lens. 
     
     
       6. An exposure calculation apparatus as claimed in claim 4, wherein said second means comprise plural light receiving means for receiving light which is transmitted through said photographing lens and focusing condition detecting means for detecting a focusing condition depending on respective outputs of the light received by said light receiving means. 
     
     
       7. An exposure calculation apparatus comprising: plural first means for measuring light incident on a plurality of regions of a photographing image plane and outputting data of the measured light;   plural second means for detecting the focusing conditions of objects present in a plurality of the regions of the photographing image plane and outputting data on the focusing conditions;   third means for detecting the position which a main object occupies in the photographing image plane depending on the data on the focusing conditions outputted from said second means;   fourth means for detecting the ratio that the image of the main object occupies in the photographing image plane;   fifth means for making a plurality of calculations, each of which is made depending on at least one of the data of measured light outputted from said first means; and   sixth means for selecting one of the plurality of calculations on the position detected by said third means and the ratio detected by said fourth means.   
     
     
       8. An exposure calculation apparatus as claimed in claim 7, wherein said fourth means include seventh means for inputting the data of the focal length of a photographing lens and eighth means for detecting the ratio that the image of the main object occupies the photographing image plane depending on the data of the focusing condition in the position, detected by said third means, in which the main object is present and the data of the focal length inputted by said seventh means. 
     
     
       9. An exposure calculation apparatus as claimed in claim 7, wherein said first means measure light which has transmitted through a photographing lens. 
     
     
       10. An exposure calculation apparatus as claimed in claim 7, wherein said second means comprise plural light receiving means for receiving lights which have transmitted through a photographing lens and focusing condition detecting means for detecting a focusing condition on respective outputs of the light received by said light receiving means.